Nothing beats a soft, buttery cookie filled with sweet jam, especially during the holidays! These Thumbprint Cookies are just that!
In a mixing bowl, cream together the softened butter, 1/3 cup of granulated sugar, and brown sugar until light and fluffy. Add in the egg yolk, both extracts and mix until well combined.
In a separate bowl, whisk together the flour, salt, and cornstarch. Gradually add to the wet ingredients, stirring until fully incorporated.
Scoop heaping tablespoons of the dough onto a parchment lined baking sheet. Roll each dough ball in the additional 1/3 cup of granulated sugar, then use the back of a teaspoon to press an indent into each cookie. Place the baking sheet into the freezer for 30 minutes.
Preheat an oven to 375°F. Remove the cookies from the freezer and fill each indent with 1/2 teaspoon of raspberry jam or enough to fill the indent. Bake for 11-12 minutes or until lightly browned around the edges. Enjoy!
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